Year	million ton-km
1970	4.5999999046
1971	5.6999998093
1972	6.8000001907
1973	10
1974	10.1999998093
1975	9.6999998093
1976	14.3000001907
1977	15.1000003815
1978	12.3000001907
1979	15.1000003815
1980	10.3000001907
1981	18.2000007629
1982	22.2999992371
1983	26
1984	26.2999992371
1985	28.7000007629
1986	45.4000015259
1987	46.9000015259
1988	52.7000007629
1989	81.8000030518
1990	101.3000030518
1991	78.6999969482
1992	117.1999969482
1993	161.3999938965
1994	209.6000061035
1995	214.6999969482
1996	207.3000030518
1997	255.3999938965
1998	246.6000061035
1999	312.8999938965
2000	385.036
2001	349.982
2002	380.794
2003	376.657
2004	370.182
2005	382.949
2006	463.902
2007	466.098
2008	480.667
2009	856.034
2010	1149.281
2011	1544.26626010139
2012	1933.67835962636
2013	2296.03873424933
2014	2630.33
2015	2882.162
2016	3493.930482468
2017	4800.237745146
2018	5949.212205544
2019	6815.50975
2020	6870.46874
2021	9338.328585454